Large Matrix with fragile fossils sticking out

[RescueMJ]

Hello, I'm a newbie. I'm looking for advice on what product to place on the fossils in the boulder below.  I want to stabilize them in the matrix before I do any more removal.  The photo with the (5) had a great rib in it but crumbled upon getting the rock into my truck.  Fossils are exposed on many sides.   As I began removing matrix with my Dremel 290, more fossils were uncovered.

 

I read many articles and posts about solution adhesives.  I want to keep it simple. I found premade Paraloid B-72 Glue, and the more complicated acetone and b-72, b-76 pellets.  I may try and use a filler on my rib (1) that has a crack.   This has been a great COVID hobby for me. My science students will get fossil remnants from me as student of the week rewards. Suggestions welcomed.